Thermodynamic evidence for a poisoning mechanism in the Al-Si-Ti system

被引：51
作者：
Quested, T. E.
Dinsdale, A. T.
Greer, A. L.
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2006年 / 22卷 / 09期
关键词：
poisoning; solidification microstructure; aluminium alloys; CALPHAD; growth restriction;
D O I：
10.1179/174328406X114234
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The poisoning of grain refinement in aluminium alloys owing to the presence of silicon is investigated using CALPHAD based thermodynamic modelling software. The existence of primary phases other than alpha-aluminium, namely TiSi2 and TiSi, which are stable at typical melt holding temperatures, is consistent with microstructural observations of other researchers. The compositional and temperature range of these phases are calculated. The software is also used to determine the effect of silicon and titanium additions on the growth rates of alpha-aluminium grains via the growth restriction parameter Q. These results are used to explain poisoning in silicon containing foundry alloys via a thorough review and discussion of the relevant literature.
引用
收藏
页码：1126 / 1134
页数：9
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